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Nanopattern Formation by Periodic Array of Interfacial Misfit Dislocations in Bi(111)/Si(001) Heteroepitaxy

Published online by Cambridge University Press:  01 February 2011

Giriraj Jnawali ,
H. Hattab ,
C. Bobisch ,
A. Bernhart ,
E. Zubkov ,
F.-J. Meyer zu Heringdorf ,
R. Möller ,
B. Krenzer  and
M. Horn-von Hoegen
Giriraj Jnawali
Affiliation:
[email protected], University of Duisburg-Essen, Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany, 0049-203-3791478, 0049-203-3791555
H. Hattab
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
C. Bobisch
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
A. Bernhart
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
E. Zubkov
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
F.-J. Meyer zu Heringdorf
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
R. Möller
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
B. Krenzer
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
M. Horn-von Hoegen
Affiliation:
[email protected], University of Duisburg-Essen, Center for Nanointegration (CeNIDE), Department of Physics, Lotherstr. 1, Duisburg, 47057, Germany
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Abstract

Despite their large lattice mismatch of 18 %, the lattices of Bi(111) and Si(001) fit surprisingly well. A remaining compressive strain in the Bi film of 2.3 % along the direction is accommodated by the formation of a periodic array of edge-type misfit dislocations confined to the interface. The strain fields surrounding each dislocation interact with each other, producing a quasi-periodic nanopattern of grating-like periodic height undulations on the surface. The separation and the amplitude of the height undulations have been derived by spot profile analyzing LEED and STM surface height profiles. The observed undulations agree well with elasticity theory.

Keywords

Bidislocationsmolecular beam epitaxy (MBE)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1059: Symposium KK – Nanoscale Pattern Formation , 2007 , 1059-KK07-07
Copyright
Copyright © Materials Research Society 2008

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References

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